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  3. The dog has often been an unselfish friend to man. It is always grateful to its master. It helps man in many ways. Certain breed

The dog has often been an unselfish friend to man. It is always grateful to its master. It helps man in many ways. Certain breed

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问题     The dog has often been an unselfish friend to man. It is always grateful to its master. It helps man in many ways. Certain breeds of dogs are used in criminal investigations. They are trained to sniff out drugs and bombs. They help police to catch criminals.
    The dogs that help in criminal investigations are trained at a school called the Military Dog Studies Branch of the U. S. Air Force in Lackland, Texas. The dogs to be trained are selected by an air force team. This team visits large cities across the country to buy the dogs. They may buy dogs from private citizens for up to $ 750 each. Some citizens freely give their dogs. The dogs selected must be healthy, brave and aggressive. They must be able to fight back if they are attacked. The dogs chosen are between the ages of one and three. They are given a medical examination when they arrive at the school. Their physical examination includes X - rays and heart tests. The trainee dogs undergo the first stage of training when they arrive in Lackland. This is an 11 -week course for patrol duty. After this course, the best dogs are selected to go on another 9 - week course. They learn drug - sniffing or bomb - sniffing. After this course, the dogs are ready for their jobs in the cities or on air force bases.
    The training given to a drug - sniffing dog is different from that given to a bomb - sniffing dog. A drug - sniffing dog is trained to scratch and dig for the drugs when he sniffs them. A bomb - sniffing dog sits down when he finds a bomb, which is the alert for hidden explosives.
Which of the following is NOT true according to this passage?
选项 A、A dog suitable for training may be bought at a price of $500.
B、After an 11 -week course, all the dogs can be used for patrol duty.
C、The best dogs are selected for further training.
D、A two - year - old dog may be a good choice for training.
答案B
解析 根据文章第二段第五句“They may buy dogs from private citizens for up to$750 each．”可知，训练人员买的小狗中最高价为750美元，所以A正确；根据文章第二段倒数第三句“After this course，the best dogs are selected to go on another 9一week course．”只有那些最好的狗才能进行下面的训练，所以C正确；文章第二段提到只有1—3岁的狗才会被挑中，所以2岁的狗在范围之内，故D正确。所以答案为B。
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